Servicing the Server

This chapter contains the following topics:

Maintaining the Server

To keep server maintenance simple, the server contains a set of components that are field-replaceable. However, not all components are field-replaceable.

For components that are not a field-replaceable unit (FRU), contact your Cisco account team to inquire about replacements.

Use the following tasks for field-service:

Removing Top Cover

Before you begin

For this procedure, gather a #2 Phillips screwdriver.

Procedure

Step 1

Using a Phillips screwdriver, loosen the M3 thumbscrew on the top cover.

Step 2

Slide the cover to back and detach the cover from the small knob screws along the sides and back of the server.

Step 3

Lift the top cover straight up to remove it from the server, then set the cover aside.

Figure 1. Removing the Top Cover

1

Top Rear Cover

Service Considerations

Be aware of the following when servicing the server:


Important

Watch your hands and fingers whenever you handle the server, sleds, and components! Narrow vertical or horizontal spaces in situations like, but not limited to, moving the server into or out of the shipping container or equipment rack can cause pinch hazards for your hands and fingers.


Warning

The fully configured server weighs approximately 265 lbs. (120 kg)! Never attempt to lift the server by yourself! Instead, use a lift, scissors jack, or some other device to lift and bear the weight of the server while you are installing or servicing it. If you must lift or handle the server without mechanical assistance, use two or more people to lift and handle server. Always use safe lifting practices when lifting or moving the server.


Note

When handling chassis components, wear an ESD strap and handle components, modules, and sled by the edges, or by designated handles when present.

The server is designed as a modular system with subsystems for compute, cooling, and so on. Subsystems are generally arranged in trays, which are field replaceable units (FRUs). However, some components in a subsystem or tray are not individually field-replaceable. The following main components are not field replaceable.

  • Mainboard

  • Power distribution board

  • Mid-plane board

  • HIB host interface Board

  • FIO board

  • Fan extension board

  • Fan interposer board

Hot Swapping the Fan Module

The server has multiple fan modules for proper cooling. Fans direct airflow front-to-back, and each fan is a hot swappable FRU. Fan replacement is a tool less procedure.

Use the following task to remove and replace a fan module.

Procedure

Step 1

Remove the hot swap fan module:

  1. Press the latch to disengage the fan module from the cage

  2. Pull the handle to detach the fan module from the server.

    Figure 2. Removing the Fan Module

Step 2

Replace the hot swap fan module:

  1. Install the hot swap fan module:

  2. Push the new fan module into the cage until it locks into place.

    Figure 3. Replacing the Fan Module

Removing and Replacing 12V Redundant PSU


Caution

Replace all cut cable ties during removal and replacement procedure. Failure to do so results in improper airflow that can lead to thermal damage.


Warning

To reduce the risk of injury from electric shock, remove all power cords to disconnect power from the system completely.

The server's 12V PSUs are toolless FRUs. Use this task to replace a 12V PSU.

Procedure

Step 1

Remove the 12V redundant power supply unit:

  1. Press the latch to disengage the power supply from the CPU tray.

  2. Pull the handle to detach the power supply while still pressing the latch.

    Figure 4. Removing the 12V Redundant PSU

Step 2

Replace the 12V redundant power supply unit:

  1. Install the 12V redundant power supply unit:

  2. Push the new power supply into the CPU tray until it locks into place.

    Figure 5. Replacing the 12V Redundant PSU

Removing and Replacing the OCP Module

The OCP Module is part of the CPU Tray above the DC-SCM Module.

OCP Module

PID

UCS C845A M8 One OCP 3.0 SFF PCIe Gen5 x8 NIC (CPU0) with two 10GbE RJ-45 Ethernet

C845A-M8-OPCM(=)

Use the following task to replace the OCP Module.

Before you begin

For this procedure, gather a #2 Phillips screwdriver.

Procedure

Step 1

Remove the OCP Module.

  1. Using a Phillips screwdriver, loosen the M3 thumbscrew.

  2. Grasp the OCP module and slide it out of the CPU Tray.

    Figure 6. Removing the OCP Module

Step 2

Install the OCP Module.

  1. Align the OCP Module with its slot on the CPU Tray.

  2. Holding the module level, slide it into the CPU Tray.

  3. When the module is flush with the CPU Tray, use the Phillips screwdriver to tighten the thumbscrews.

Figure 7. Installing the OCP Module

Removing and Replacing the E1.S NVMe Drive

The server supports E1.S NVMe SSDs in the front-loading drive bays.

Before you begin

For this procedure, gather a #2 Phillips screwdriver.

Procedure

Step 1

Remove the E1.S NVMe SSD carrier assembly from the chassis:

  1. Push the drive carrier button to disengage the drive carrier bezel.

  2. Pull the drive carrier bezel to detach the carrier assembly from the chassis.

  3. Remove the carrier assembly from the chassis.

    Figure 8. Removing the NVMe/SSD Carrier Assembly

Step 2

Remove the E1.S NVMe SSD drive from the carrier:

  1. Using a Phillips screwdriver, remove the two (2) screws.

  2. Remove the E1.S NVMe SSD drive from the carrier.

    Figure 9. Removing the E1.S NVMe SSD from the Carrier Assembly

Step 3

Install E1.S NVMe SSD drive to the carrier:

  1. Place the NVMe/SAS SSD drive into the chassis.

  2. Using a Phillips screwdriver, insert and tighten the two (2) screws to secure the NVMe/SAS SSD drive to the carrier.

    Figure 10. Replacing the NVMe/SSD in the Carrier Assembly

Step 4

Install E1.S NVMe SSD carrier assembly to the chassis:

  1. Place the E1.S NVMe SSD carrier assembly into the chassis.

  2. Push the carrier assembly into the chassis until it latches into place.

    Figure 11. Replacing the NVMe/SSD Carrier Assembly

Removing and Replacing the DC-SCM Module

The DC-SCM Module is part of the CPU Tray below the OCP Module. The module is a FRU that is offered in the following options depending on the type of CPU and GPU installed in the server.

DC-SCM Module

PID

UCS C845A M8 DC-SCM Card Module supporting NVIDIA GPU, 5th Gen AMD EPYC CPU

C845A-M8-DCSCM(=)

Use the following task to replace the DC-SCM Module.

Before you begin

For this procedure, gather a #2 Phillips screwdriver.

Procedure

Step 1

Remove the DC-SCM Module.

  1. Using a Phillips screwdriver, loosen the M3 thumbscrew.

  2. Grasp the DC-SCM module and slide it out of the CPU Tray.

    Figure 12. Removing the DC-SCM Module

Step 2

Install the DC-SCM Module.

  1. Align the DC-SCM Module with its slot on the CPU Tray.

  2. Holding the module level, slide it into the CPU Tray.

  3. When the module is flush with the CPU Tray, use the Phillips screwdriver to tighten the thumbscrews.

Removing and Replacing the GPU

Before you begin

For this procedure, gather a #2 Phillips screwdriver.

Procedure

Step 1

Remove the rear top cover from the chassis. Removing Top Cover

  1. Remove the two screws.

  2. Detach the rear top cover from the chassis.

    Figure 13. Removing the cover from the chassis

Step 2

Remove the GPU:

  1. Detach the GPU from the PCIe slot.

    Figure 14. Removing GPU

Step 3

Replacing the GPU

  1. Place the GPU into the PCIe slot and push it down until it latches into place.

    Figure 15. Replacing the GPU

Step 4

Install the rear top cover:

  1. Place the rear top cover onto the chassis.

  2. Secure the rear top cover to the chassis using two screws.

    Figure 16. Replacing Rear Top Cover